i'm reliably informed that the hands on his head gesture is because he has an 'M' in his name mo and thats why he does it
I'm reliably informed that there was a Juan Kin The Mexican footballer - proper good goal celebration
I actually know the answer to this. He was on the programme "A League Of Their Own" on Sky and James Corden suggested to Mo that if he won Olympic gold he do that letter M thing. He promised he would do it and kept true to his word. Boring I know but true.